"Carefully opening the power supply and lifting the top reveals the 140mm Yate Loon fan. This fan is rated at 2800 RPM, 140 CFM and 48.5dBA at 12 volts. An awful lot of airflow and high noise penalty as well. The upside to this fan is that it is temperature controlled and should be quite silent when not spooled up. Included on this fan is a clear plastic deflector toward the rear of the case. This presumably is to force more air through the power supply to provide adequate cooling rather than allow the rear airflow to just blow out the back of the power supply with no cooling benefit."